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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　spring boot 作为一个越来越流行的微服务框架，收到了广大程序员的欢迎。随着使用场景越来越多，遇到的问题也就越来越多。这里我们将介绍一下spring boot的多数据源的实践，下面的示例我们实现了两个JdbcTemple和一个mybatis数据源的配置！</p>
<h2 id="u914D_u7F6E_u6570_u636E_u6E90"><a href="#u914D_u7F6E_u6570_u636E_u6E90" class="headerlink" title="配置数据源"></a>配置数据源</h2><p>　　在spring boot中，所有的配置都可以在application.properties中完成，数据源的配置也是如此!<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">#数据源1</span><br><span class="line">spring.ds_items.driverClassName=com.mysql.jdbc.Driver</span><br><span class="line">spring.ds_items.url=jdbc:mysql://localhost:3306/demo1</span><br><span class="line">spring.ds_items.username=root</span><br><span class="line">spring.ds_items.password=123456</span><br><span class="line"></span><br><span class="line">#数据源2</span><br><span class="line">spring.ds_users.driverClassName=com.mysql.jdbc.Driver</span><br><span class="line">spring.ds_users.url=jdbc:mysql://localhost:3306/demo2</span><br><span class="line">spring.ds_users.username=root</span><br><span class="line">spring.ds_users.password=123456</span><br><span class="line"></span><br><span class="line">#数据源3</span><br><span class="line">spring.ds_fruit.driverClassName=com.mysql.jdbc.Driver</span><br><span class="line">spring.ds_fruit.url=jdbc:mysql://localhost:3306/demo3</span><br><span class="line">spring.ds_fruit.username=root</span><br><span class="line">spring.ds_fruit.password=123456</span><br></pre></td></tr></table></figure></p>
<p>　　这里我们配置了三个数据源类，由于数据库服务器不够，这里三个数据源为同一个服务器的三个数据库，对我们的示例没有什么影响！</p>
<h2 id="u6570_u636E_u6E90"><a href="#u6570_u636E_u6E90" class="headerlink" title="数据源"></a>数据源</h2><p>　　下面我们新建了三个数据源配置类，通过配置文件三个数据源的不同前缀来保证加载不同的数据源配置。三个数据源分配命名为：primaryDS、secondaryDS和thirdDS，注意第一个数据源多了一个注解@Primary。<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Configuration</span></span><br><span class="line"><span class="comment">//@ConfigurationProperties(prefix = "spring.ds_items")</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseItemsConfig</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"primaryDS"</span>)</span><br><span class="line">    <span class="annotation">@Primary</span> <span class="comment">//默认数据源</span></span><br><span class="line">    <span class="annotation">@ConfigurationProperties</span>(prefix=<span class="string">"spring.ds_items"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> DataSource <span class="title">primaryDataSource</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> DataSourceBuilder.create().build();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"jdbcItems"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> JdbcTemplate <span class="title">jdbcTemplate</span><span class="params">(@Qualifier(<span class="string">"primaryDS"</span>)</span>DataSource dsItems) </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> JdbcTemplate(dsItems);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="annotation">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DatabaseUsersConfig</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"secondaryDS"</span>)</span><br><span class="line">    <span class="annotation">@ConfigurationProperties</span>(prefix=<span class="string">"spring.ds_users"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> DataSource <span class="title">primaryDataSource</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> DataSourceBuilder.create().build();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"jdbcUsers"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> JdbcTemplate <span class="title">jdbcTemplate</span><span class="params">(@Qualifier(<span class="string">"secondaryDS"</span>)</span>DataSource dsItems) </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> JdbcTemplate(dsItems);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="annotation">@Configuration</span></span><br><span class="line"><span class="annotation">@MapperScan</span>(basePackages =<span class="string">"com.shc.spring.boot.mapper"</span>,</span><br><span class="line">        sqlSessionFactoryRef=<span class="string">"mybatisSessionFactory"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MybatisDBConfig</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"thirdDS"</span>)</span><br><span class="line">    <span class="annotation">@ConfigurationProperties</span>(prefix=<span class="string">"spring.ds_fruit"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> DataSource <span class="title">thirdDataSource</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> DataSourceBuilder.create().build();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span>(name=<span class="string">"mybatisSessionFactory"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> SqlSessionFactory <span class="title">sqlSessionFactory</span><span class="params">(@Qualifier(<span class="string">"thirdDS"</span>)</span>DataSource datasource) <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="keyword">final</span> SqlSessionFactoryBean sessionFactory = <span class="keyword">new</span> SqlSessionFactoryBean();</span><br><span class="line">        sessionFactory.setDataSource(datasource);</span><br><span class="line">        sessionFactory.setConfigLocation(<span class="keyword">new</span> ClassPathResource(<span class="string">"mybatis-config.xml"</span>));</span><br><span class="line">        <span class="keyword">return</span> sessionFactory.getObject();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u6570_u636E_u8BBF_u95EE_u5C42"><a href="#u6570_u636E_u8BBF_u95EE_u5C42" class="headerlink" title="数据访问层"></a>数据访问层</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ItemRepository</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Autowired</span></span><br><span class="line">    <span class="annotation">@Qualifier</span>(<span class="string">"jdbcItems"</span>)</span><br><span class="line">    <span class="keyword">protected</span> JdbcTemplate jdbcItems;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Autowired</span></span><br><span class="line">    <span class="annotation">@Qualifier</span>(<span class="string">"jdbcUsers"</span>)</span><br><span class="line">    <span class="keyword">protected</span> JdbcTemplate jdbcUsers;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Item <span class="title">getItem</span><span class="params">(<span class="keyword">long</span> id)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> jdbcItems.queryForObject(<span class="string">"SELECT * FROM t_item WHERE f_id=?"</span>, itemMapper, id);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> RowMapper&lt;Item&gt; itemMapper = <span class="keyword">new</span> RowMapper&lt;Item&gt;() &#123;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> Item <span class="title">mapRow</span><span class="params">(ResultSet rs, <span class="keyword">int</span> rowNum)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">            Item item = <span class="keyword">new</span> Item(rs.getLong(<span class="string">"f_id"</span>), rs.getString(<span class="string">"f_title"</span>));</span><br><span class="line">            <span class="keyword">return</span> item;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> User <span class="title">getUser</span><span class="params">(<span class="keyword">long</span> id)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> jdbcUsers.queryForObject(<span class="string">"SELECT * FROM t_user WHERE f_id=?"</span>, userMapper, id);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> RowMapper&lt;User&gt; userMapper = <span class="keyword">new</span> RowMapper&lt;User&gt;() &#123;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> User <span class="title">mapRow</span><span class="params">(ResultSet rs, <span class="keyword">int</span> rowNum)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">            User user = <span class="keyword">new</span> User(rs.getLong(<span class="string">"f_id"</span>), rs.getString(<span class="string">"f_name"</span>));</span><br><span class="line">            <span class="keyword">return</span> user;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>　　mybatis的配置这里不再贴出，最后看看启动程序！</p>
<h2 id="u542F_u52A8"><a href="#u542F_u52A8" class="headerlink" title="启动"></a>启动</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoApplication</span> <span class="keyword">implements</span> <span class="title">CommandLineRunner</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Autowired</span></span><br><span class="line">    ItemRepository itemRepository;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Autowired</span></span><br><span class="line">    FruitMapper fruitMapper;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        SpringApplication springApplication = <span class="keyword">new</span> SpringApplication(DemoApplication.class);</span><br><span class="line">        springApplication.run(args);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">(String... args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        Item item = itemRepository.getItem(<span class="number">1</span>);</span><br><span class="line">        System.out.println(item);</span><br><span class="line"></span><br><span class="line">        User user = itemRepository.getUser(<span class="number">1</span>);</span><br><span class="line">        System.out.println(user);</span><br><span class="line"></span><br><span class="line">        Fruit fruit = fruitMapper.selectById(<span class="number">1</span>);</span><br><span class="line">        System.out.println(fruit);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h1 id="SQL"><a href="#SQL" class="headerlink" title="SQL"></a>SQL</h1><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="operator"><span class="keyword">use</span> demo1;</span></span><br><span class="line"><span class="operator"><span class="keyword">create</span> <span class="keyword">table</span> t_item(</span><br><span class="line">  f_id <span class="built_in">int</span>,</span><br><span class="line">  f_title <span class="built_in">varchar</span>(<span class="number">32</span>)</span><br><span class="line">);</span></span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> t_item(f_id, f_title)<span class="keyword">values</span>(<span class="number">1</span>, <span class="string">'spring boot book'</span>);</span></span><br><span class="line"></span><br><span class="line"><span class="operator"><span class="keyword">use</span> demo2;</span></span><br><span class="line"><span class="operator"><span class="keyword">create</span> <span class="keyword">table</span> t_user(</span><br><span class="line">  f_id <span class="built_in">int</span>,</span><br><span class="line">  f_name <span class="built_in">varchar</span>(<span class="number">32</span>)</span><br><span class="line">);</span></span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> t_user(f_id, f_name)<span class="keyword">values</span>(<span class="number">1</span>, <span class="string">'learner'</span>);</span></span><br><span class="line"></span><br><span class="line"><span class="operator"><span class="keyword">use</span> demo3;</span></span><br><span class="line"><span class="operator"><span class="keyword">create</span> <span class="keyword">table</span> t_fruit(</span><br><span class="line">  f_id <span class="built_in">int</span>,</span><br><span class="line">  f_name <span class="built_in">varchar</span>(<span class="number">32</span>)</span><br><span class="line">);</span></span><br><span class="line"><span class="operator"><span class="keyword">insert</span> <span class="keyword">into</span> t_fruit(f_id, f_name)<span class="keyword">values</span>(<span class="number">1</span>, <span class="string">'苹果'</span>);</span></span><br></pre></td></tr></table></figure>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　这里我们就完成了所有的代码，源码下载地址：<a href="/code/spring-boot-multi-datasource.zip">spring-boot-multi-datasource.zip</a></p>

      
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